Which of the following is an example of the doppler effect? (2 points)
a ocean waves from two different directions that have canceled each other out
b scientists show that different colored lights have different wavelengths
c the movement of objects due to unbalanced forces
d a train blows its horn as it travels towards you, and you perceive the pitch of the horn to increase

54 degrees incident angle = reflected angle

angle is from normal turned to line of ray

find the sum of the two horizontal vectors and the sum of the two vertical vectors

isoceles right angled triangle

the design of a ski jumping suit involves a trade-off between giving the skiers lift to get higher jumps and ensuring the skier does not face a lot of drag before the jump itself. an expansive suit may to lift the skier higher, but at the same time, it will also increase the air resistance. higher air resistance as the skier goes down the slope limits the speed of the jump. a big suit also increases the risk of losing balance or control, especially if there's a strong gust of wind. while technologically enhanced suits a lot, clothing is not the only factor in a ski jumper’s success. gathering speed while skiing down the slope, ensuring good speed on the ramp, and maintaining good body posture and form in the air all contribute to a ski jumper's success.